Safety relay box system
US9791901B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2013 |
| Grant date | Oct 17, 2017 |
| Priority date | — |
| Expiry date | May 19, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/182
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A dual redundant computer safety relay box system includes first and second fail-safe computing systems (FSCs) individually mounted to first and second printed circuit boards. Each FSC includes two computing modules (CPUs) designated as a first CPU and a second CPU. The first and second FSC's are both connected to a safety relay box. The printed circuit boards are isolable from each other permitting maintenance on one of the printed circuit boards while operation of the FSC of the other printed circuit board is maintained. In each FSC a health signal generated from the first and second printed circuit boards of the first and second CPUs defines a multi-level dynamic pulse signal. Presence of the dynamic pulse signal produces an output identified as each of a first and a second healthy indication signal from each of the CPUs of one of the first or second FSCs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.